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01-26-2011, 03:10 PM
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CC Member
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Join Date: Aug 2008
Cobra Make, Engine:
Posts: 1,106
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Not Ranked
Surging / misfiring with MassFlo
Just thought I would share a problem solved with my Mass flo kit.
Engine would run at idle and at wot but would surge at low throttle opening while driving.
I have a large oval COBRA air cleaner which sits above bonnet line and below scoop.
Problem was airflow entering filter and rushing across maf meter causing a disturbance therefore throwing out its readings.
I taped the front of the filter so air couldn't rush in there and problem solved...
Only mentioning this incase someone else is also tearing their hair out trying to find out why?????
Now off to the dyno!!!
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01-26-2011, 03:44 PM
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CC Member
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Join Date: Feb 2006
Location: Paradise Point,
Qld
Cobra Make, Engine: Absolute Pace
Posts: 1,205
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Not Ranked
Sounds exciting,
You wont be dissapointed with the dart bottom end, what heads are you running?
Phil
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Not all driveways reach the street!
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01-26-2011, 05:15 PM
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CC Member
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Join Date: Jun 2007
Location: Sunshine Coast Qld,
QLD
Cobra Make, Engine: Harrison # 80; Ford 5.0L HO Trickflow heads, cam and rockers and MassFlow EFI
Posts: 3,482
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Not Ranked
Interesting. I have some minor probs with mine on low throttle, especially when motor is cold. Won't run at low revs very well then. I have the same filter set up. I guessed it was the large injectors being asked to do very fine metering at low revs. Will just cover the scoop intake and see if that makes any difference.
__________________
Merv
Ford Cobra
Harrison #80.
Peregian Beach
Sunshine Coast Qld.
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01-26-2011, 09:04 PM
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CC Member
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Join Date: Aug 2008
Cobra Make, Engine:
Posts: 1,106
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Quote:
Originally Posted by Philm
Sounds exciting,
You wont be dissapointed with the dart bottom end, what heads are you running?
Phil
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Phil,
Just my trick flow 170's. Won't make big hp but should have a reasonable amount of torque. Have only done a couple hundred k's on it so far and only about 50k with it running ok. Definitely more punch than the 302! Can't wait for Winton. You are going there aren't you?
Merv,
Yeah we were really scratching our heads. (well pete was, I had no idea....) I even bought another 044 fuel pump...
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01-26-2011, 09:56 PM
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CC Member
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Join Date: Jun 2007
Location: Sunshine Coast Qld,
QLD
Cobra Make, Engine: Harrison # 80; Ford 5.0L HO Trickflow heads, cam and rockers and MassFlow EFI
Posts: 3,482
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Not Ranked
I also got another pump ... just shows, time and thought can be a solution. Will try this tomorrow.
__________________
Merv
Ford Cobra
Harrison #80.
Peregian Beach
Sunshine Coast Qld.
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01-26-2011, 11:15 PM
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CC Member
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Join Date: Feb 2006
Location: Paradise Point,
Qld
Cobra Make, Engine: Absolute Pace
Posts: 1,205
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Not Ranked
Definitely see you at winton.
Phil
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Not all driveways reach the street!
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01-26-2011, 11:48 PM
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CC Member
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Join Date: Nov 2006
Location: Gold Coast Queensland,
QLD
Cobra Make, Engine: Harrison#97 LS7 / T56
Posts: 1,681
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Not Ranked
Won't make big hp but should have a reasonable amount of torque
Beware of all you "Big Block Bullies"......sleeping giants!
Cheers,
See you at Winton !
Warren.
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01-27-2011, 07:50 AM
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CC Member
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Join Date: Mar 2006
Location: El Paso,
tx
Cobra Make, Engine: FRR MKIII 408w
Posts: 340
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Not Ranked
Quote:
Originally Posted by Towmaster
Just thought I would share a problem solved with my Mass flo kit.
Engine would run at idle and at wot but would surge at low throttle opening while driving.
I have a large oval COBRA air cleaner which sits above bonnet line and below scoop.
Problem was airflow entering filter and rushing across maf meter causing a disturbance therefore throwing out its readings.
I taped the front of the filter so air couldn't rush in there and problem solved...
Only mentioning this incase someone else is also tearing their hair out trying to find out why?????
Now off to the dyno!!!
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Yep read about this on the FFR site several years ago...they used a pice of alum. in fromt of air filter.
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01-27-2011, 11:38 AM
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CC Member
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Join Date: Jun 2007
Location: Sunshine Coast Qld,
QLD
Cobra Make, Engine: Harrison # 80; Ford 5.0L HO Trickflow heads, cam and rockers and MassFlow EFI
Posts: 3,482
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Not Ranked
Why not just block the scoop?
__________________
Merv
Ford Cobra
Harrison #80.
Peregian Beach
Sunshine Coast Qld.
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01-27-2011, 02:40 PM
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CC Member
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Join Date: Oct 2004
Location: Brisbane,Queenslander,Australia,
QLD
Cobra Make, Engine: Drb,5.6 8tb Windsor,TFS heads,Dart Shp,TKO600 ,4link 9in diff.Ford acid rush Paint,convopro wheels.
Posts: 98
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Not Ranked
Merv,
I think your filter is below the bonnet line anyway in a harrison so prob out of the airstream,
but the air from the thermofan could also disturb if their this sensitive and it looks like they are...
Brighty also has a Stage2 airmeter which has more resolution for bigger injectors 36+ so could possibly be more prone to this than the stage 1.
I think an internal baffle inside the filter is the answer as you still want the benefit of cold air from scoop if possible.
__________________
Horsepower sells engines,Torque Breaks 9 inches...
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01-27-2011, 03:47 PM
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CC Member
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Join Date: Jun 2007
Location: Sunshine Coast Qld,
QLD
Cobra Make, Engine: Harrison # 80; Ford 5.0L HO Trickflow heads, cam and rockers and MassFlow EFI
Posts: 3,482
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Not Ranked
Yes Peter I was thinking of an internal baffle. Good idea and thanks.
__________________
Merv
Ford Cobra
Harrison #80.
Peregian Beach
Sunshine Coast Qld.
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01-28-2011, 06:44 PM
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CC Member
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Join Date: Jun 2007
Location: Sunshine Coast Qld,
QLD
Cobra Make, Engine: Harrison # 80; Ford 5.0L HO Trickflow heads, cam and rockers and MassFlow EFI
Posts: 3,482
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Not Ranked
Done and very nice!
__________________
Merv
Ford Cobra
Harrison #80.
Peregian Beach
Sunshine Coast Qld.
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